JPH11323379A - Solid detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid detergent composition which is lowly irritative, excellent in solidity, hardly dissolving/collapsing, excellent in feeling of use, less adherent to soap boxes etc., and excellent in hard water resistance. SOLUTION: The solid detergent composition comprises (A) an N-acyl neutral amino acid salt having a 10-14C acyl group (it may contain unneutralized N-acyl neutral amino acid) and (B) an N-acyl acidic amino acid salt having a 16-20C acyl group (it may contain unsaturated N-acyl acidic amino acid), the proportion of the components (A) to (B) being (A)/(B)=85/15-55/45 by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid detergent composition and, more particularly, to a low irritation, excellent solidity, hard to disintegrate, excellent in use feeling, no adhesion to a soap box, and hard water resistance. The present invention relates to a solid detergent composition excellent in water resistance.

[0002]

2. Description of the Prior Art Solid detergent compositions generally contain an anionic surfactant as a main component, and higher fatty acid salts are most commonly used. Although the higher fatty acid salt is excellent in foaming, it is highly irritating to the skin due to its alkaline pH, and further generates water-insoluble scum in hard water, so that the foaming power and detergency are significantly reduced. In addition, there is a problem that the skin feels squeaky and firm when rinsing. As an anionic surfactant with low irritation to the skin,
N-acyl glutamates are well known. N-acyl glutamate has a weakly acidic pH, is less irritating to the skin, and has excellent hard water resistance, but has a slimy feeling when used, and adheres to containers when left in a soap container or the like. There was a problem of doing it.

On the other hand, N-acyl-β-alanine salts,
N-acyl neutral amino acid salts such as acylglycine salts are also known as low-irritating anionic surfactants. For example, JP-A-5-156297 discloses N-acyl-β
-A hypoallergenic solid detergent based on sodium alanine is disclosed. These N-acyl neutral amino acid salts are less slimy than the N-acyl acidic amino acid salts and have a refreshing feel. Also,
Shows good foaming even in mildly acidic areas on the skin,
Small adhesion to containers.

[0004] In these N-acyl neutral amino acid salts, when the chain length of the acyl group is less than 10, foaming is remarkably reduced. If the chain length is too long, the feel tends to decrease. Therefore, the detergent composition has 10 to 14 carbon atoms, especially 12 carbon atoms.
The most commonly used is a lauroyl group or a coconut oil fatty acid acyl group containing this as a main component. However,
When a solid detergent composition is prepared using such an N-acyl neutral amino acid salt as a main base material, there is a problem that solidity is low and melting and disintegration easily occur. In addition, it was not sufficient in terms of hard water resistance.

Japanese Patent Application Laid-Open No. 5-156287 discloses a detergent composition comprising an N-acyl-β-alanine salt and a combination thereof with an N-acyl acidic amino acid salt. The only one specifically disclosed is a liquid cleaning composition. There has been no known example of a combination of these two N-acyl amino acid salts studied to solve the above-mentioned problems with respect to a solid detergent composition.

[0006]

DISCLOSURE OF THE INVENTION The object of the present invention is to provide a solid wash which is low-irritant, excellent in solidity, hard to melt and disintegrate, excellent in use feeling, has little adhesion to a soap box, and has excellent hard water resistance. Agent composition.

[0007]

Means for Solving the Problems The present inventor has conducted intensive studies in view of the above circumstances, and as a result, has found that an N-acyl neutral amino acid salt having an acyl group having 10 to 14 carbon atoms and an N-acyl neutral amino acid salt having 16 carbon atoms.
The present inventors have found that the above problems can be solved by using a solid detergent containing a N-acyl acidic amino acid salt having an acyl group of from 20 to 20 in a specific ratio, and completed the present invention.

That is, the present invention relates to (A) a compound having 10 to 1 carbon atoms.
N-acyl neutral amino acid salt having an acyl group of 4 (including an unneutralized N-acyl neutral amino acid) and (B)
It contains an N-acyl acidic amino acid salt having an acyl group having 16 to 20 carbon atoms (including an unneutralized N-acyl acidic amino acid), and the weight ratio of component (A) to component (B) is (A) / (B) = 85/15 to 55/45.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION As the NN-acyl neutral amino acid salt having an acyl group having 10 to 14 carbon atoms of the component (A) used in the present invention, N-acylglycine salt and N-acylglycine salt are used.
Acylalanine salt, N-acyl-β-alanine salt, N-
Acyl-N-methyl-β-alanine salt, N-acyl taurine salt, N-acyl-N-methyl taurine salt, N-acyl sarcosine salt, N-acyl threonine salt, N-acyl valine salt, N-acyl leucine salt, N -Acyl isoleucine salts, N-acyl serine salts and the like. These N-acyl neutral amino acid salts can be used in any of D-form, L-form and DL-form. These N-acyl neutral amino acid salts may be used alone or in combination of two or more at an arbitrary ratio.

Among the above N-acyl neutral amino acid salts,
N-acylglycine salt, N-acylalanine salt, N-acyl-β-alanine salt, N-acyl-N-methyl-β-
Alanine salts and N-acyl taurine salts are preferably used. Of these, N-acylglycine salts, N-acylalanine salts, and N-acyl-β-alanine salts are particularly preferred because of their excellent low irritation. Among them, N-acylglycine salts and N-acylalanine salts are more preferable in terms of the foam feeling such as foam stickiness and stiffness at the time of washing, a less slimy feeling and a refreshing feel, and particularly the above-mentioned feeling of use and solidity. N-acylglycine salts are the most excellent in this respect.

The acyl group of the N-acyl neutral amino acid salt of the component (A) in the present invention is a linear or branched, saturated or unsaturated acyl group having 10 to 14 carbon atoms. If the number of carbon atoms is less than 10, foaming is reduced, solidity is hardly maintained, and disintegration is also reduced. In addition, the number of carbon atoms is 1
If it exceeds 4, the feeling of stickiness and stiffness of the foam decreases,
Foaming also tends to decrease. Particularly preferred is an acyl group having 12 carbon atoms, and the mixed fatty acid residue is preferably a coconut oil fatty acid acyl group containing this as a main component. An N-acyl neutral amino acid salt having an acyl group other than 10 to 14 carbon atoms may be contained, but in order to sufficiently exert the effects of the present invention, the total amount of the N-acyl neutral amino acid salt is usually , Preferably less than 20% by weight, more preferably less than 10% by weight.

The N-acyl acidic amino acid salt of the component (B) in the present invention includes N-acyl glutamate, N
-Acyl aspartate and the like. Particularly, N-acyl glutamate is preferred. These N-acyl acidic amino acid salts can be used in any of D-form, L-form and DL-form. These N-acyl acidic amino acid salts may be used alone or in a combination of two or more at an arbitrary ratio.

The acyl group of the N-acyl acidic amino acid salt of the component (B) in the present invention is a linear or branched saturated or unsaturated acyl group having 16 to 20 carbon atoms. If the number of carbon atoms is less than 16, solidity, disintegration is reduced,
On the other hand, when it exceeds 20, the slimy feeling becomes strong and the reduction in foaming becomes large. Particularly preferred is an acyl group having 18 carbon atoms, and as the mixed fatty acid residue, a hardened tallow fatty acid acyl group containing this as a main component is preferred. Further, an N-acyl acidic amino acid salt having an acyl group other than 16 to 20 carbon atoms may be contained, but in order to sufficiently exert the effects of the present invention, the total amount of the N-acyl acidic amino acid salt is usually , Less than 30% by weight, preferably less than 20% by weight, more preferably less than 10% by weight, particularly preferably less than 5% by weight.

Component (A) and Component (B) in the present invention
Examples of the salt include metal salts such as sodium salt, potassium salt and magnesium salt, and organic salts such as arginine salt, lysine salt and histidine salt. Sodium, potassium, and arginine salts are preferred for obtaining excellent solidity, and the sodium salt is particularly preferred. These salts may be neutralized with one kind of base, or may be further neutralized with two or more kinds of bases. In addition, N-acylglutamate having two carboxyl groups and N-acylglutamate
Acyl aspartate may be a di-salt or a mono-salt,
Any neutralization degree may be used.

The components (A) and (B) of the present invention need not always be used in the form of a salt, but may be used as a mixture with an unneutralized product. However, only the unneutralized material does not foam, so that a part thereof is always blended in a salt form.
Of course, when preparing the solid detergent composition, the unneutralized one may be neutralized with an alkali such as sodium hydroxide or potassium hydroxide, and a part or all of the composition may be in the form of a salt. The content ratio of the non-neutralized product is generally not more than 1/1 and preferably not more than 1/3. If the proportion of the unneutralized material is too large, the foaming becomes poor.

[0016] In addition to the component (A) and the component (B) of the present invention, a solid wax is further added as the component (C),
Further, solidity and disintegration can be improved. A solid wax having a melting point of 40 ° C to 120 ° C is used. The temperature is preferably from 50C to 100C, particularly preferably from 60C to 90C. If the melting point of the solid wax is too low, the solid detergent composition is easily liquefied, so that the stability and solidity of the solid detergent composition decrease. On the other hand, if the melting point is too high, the solid wax composition is not sufficiently dissolved during the production and processing of the solid detergent composition, and the compatibility with other components is poor, and it is difficult to obtain a uniform solid detergent composition. Cases arise.

Preferred examples of the solid wax include hydrocarbon waxes such as solid paraffin wax, ceresin and microcrystalline wax, and waxes such as carnauba wax, candelilla wax and beeswax. Each of these solid waxes may be used alone, or two or more of them may be used in a mixture at an arbitrary ratio. In particular, the hydrocarbon solid wax exemplified above is preferable. As microcrystalline wax, Hi-Mic-1080, 3090, 10
70, 2065, and 1045.

Further, by adding an acidic amino acid or a salt thereof as the component (D) in addition to the components (A) and (B) used in the present invention, cracking of the solid detergent composition under low humidity can be prevented. Can be improved. Glutamic acid, aspartic acid and salts thereof are typical examples of acidic amino acids and salts thereof. These acidic amino acids and salts thereof can be used alone or as a mixture of two or more kinds at an arbitrary ratio. Glutamic acid and its salts are particularly preferred. These acidic amino acids and salts thereof can be used irrespective of D-form, L-form and DL-form. By the combination of such an acidic amino acid and its salt,
Not only can cracking under low humidity be suppressed, but also the moist feeling of the skin after use can be improved. Examples of the salts of these acidic amino acid salts include metal salts such as sodium salt, potassium salt and magnesium salt, and organic salts such as arginine salt, lysine salt and histidine salt. Particularly, a sodium salt and a potassium salt are preferable, and a sodium salt is most preferable. The acidic amino acid salt may be neutralized with one type of base, or may be neutralized with two or more types of bases.

In the acidic amino acid and the salt thereof of the component (D), the component (D) used may be entirely a salt,
All may be used in the form of an unneutralized acid, or may be used adjusted to an arbitrary degree of neutralization. Of course, when preparing the solid detergent composition, the unneutralized acid may be neutralized with an alkali such as sodium hydroxide or potassium hydroxide, and a part or all of the acid may be in the form of a salt. However, when a part or the whole is used as an acid, it is better not to lower the pH of the solid detergent composition too much as described later.

The solid detergent composition of the present invention preferably has a pH of 5.5 to 7.0 from the viewpoint of low irritation. A more preferred pH is between 6.2 and 6.8. Further, when the pH is less than 5.5, the foaming is significantly reduced, and when the pH is more than 7.0, melting and collapse tend to occur. In the case of higher fatty acid salts, etc., when the pH is lowered to a neutral to weakly acidic range which is mild to the skin, foaming is remarkably reduced, but the anionic surfactants of the components (A) and (B) in the present invention have such properties. It shows relatively good foaming even in a wide pH range. The pH of the solid detergent composition referred to in this specification is 1% of the solid detergent composition.
It means the pH of the aqueous solution (40 ° C.).

Adjustment of the solid detergent composition to the above-mentioned preferred pH range can be carried out by lowering the degree of neutralization of the anionic surfactants of the components (A) and (B), as well as by any other method. It can be carried out by appropriately mixing an acid or an alkali. Examples of the acid used include citric acid, in addition to the acidic amino acid used as the component (D).
Acetic acid, lactic acid, malic acid, p-toluenesulfonic acid, tartaric acid, glycolic acid, pyrrolidone carboxylic acid, hydrochloric acid, sulfuric acid, phosphoric acid, carbonic acid, nitric acid, and the like.As the alkali, sodium hydroxide, potassium hydroxide, arginine, Lysine, histidine and the like can be mentioned.

The mixing ratio of component (A) to component (B) in the solid detergent composition of the present invention is (A) / (B) = 8 by weight.
5 / 15-55 / 45, preferably 80 / 20-55 /
45, more preferably 70/30 to 55/45.
If the compounding ratio (A) / (B) exceeds 85/15, the solidity becomes poor, the material easily melts and collapses, and the hard water resistance decreases. When the mixing ratio (A) / (B) is less than 55/45,
Problems such as slimy feeling during use, adhesion to a soap container, and reduced foaming occur. In addition, component (A), component (B)
, Each unneutralized form may be contained, and the above mixing ratio is a value including these contents.

The amount of the components (A) and (B) in the solid detergent composition of the present invention is 30 to 95% by weight, preferably 40 to 95% by weight, and more preferably 50 to 90% by weight. Of course, the numerical values described herein include not only the salt of the anionic surfactant in the present invention but also the unneutralized form. When the component (A) is less than 50% by weight,
It is preferable to add another anionic surfactant in order to maintain foaming and solidity, and to make the total amount of the anionic surfactant 50% by weight or more.

The amount of the component (C) solid wax in the present invention is 2 to 20% by weight in the solid detergent composition.
Preferably it is 5 to 10% by weight. If the content is less than 2% by weight, the effect of improving solidity and disintegration is not sufficient.
On the other hand, if it exceeds 20% by weight, foaming becomes poor.

The amount of the component (D) acidic amino acid and its salt in the present invention is 1 to 4 in the solid detergent composition.
0% by weight, preferably 3 to 20% by weight, more preferably 5 to 10% by weight. If it is less than 1% by weight, the effect of improving cracks may not be sufficiently obtained, while if it is more than 40% by weight, it tends to melt and collapse.

In the solid detergent composition of the present invention, various additives usually used can be added as long as the effects of the present invention are not impaired. For example, cetyl alcohol,
Higher alcohols such as stearyl alcohol, behenyl alcohol, isostearyl alcohol, octyldodecanol, oleyl alcohol, and myristyl alcohol;
Higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, hardened tallow fatty acid, coconut oil fatty acid, palm oil fatty acid and salts thereof, humectants such as propylene glycol, butylene glycol, glycerin, sorbitol, trimethylglycine, anionic Surfactants, cationic surfactants, amphoteric surfactants, surfactants such as nonionic surfactants, vegetable oils, animal oils and fats, natural oils and fats derivatives, mineral oils and fats, lower and higher fatty acid esters,
Synthetic fats and oils such as N-acylglutamic acid esters, silicone compounds, polymer substances, alcohols, polyhydric alcohols, plant and animal extracts, amino acids, nucleic acids, vitamins, enzymes, anti-inflammatory agents, bactericides, preservatives, antioxidants , UV absorbers, chelating agents, antiperspirants, oxidation dyes, pH adjusters, pearling agents, etc.
Raw materials described in various official regulations such as quasi-drug raw material standards, Japanese Pharmacopoeia, Japanese Pharmacopoeia Standards for Pharmaceutical Ingredients, and Official Additives for Food Additive.

[0027]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

[Preparation of a solid detergent composition] A solid detergent composition having the composition shown in Table 1 was prepared by the following method. That is, after the solid components are uniformly mixed by a kneader, the liquid components are gradually added while stirring is continued, and stirring is continued until the whole becomes uniform. Next, the mixed composition is further kneaded with three rolls, and if necessary, the rolls are heated or cooled to form a uniform sheet. Next, the sheet-shaped composition is extruded into an extruder to obtain a columnar soap. If the columnar surface is not even and smooth, heat or cool the extruder and repeat the extrusion. The columnar composition is molded into a normal soap shape by a stamping machine. If it is difficult to remove from the mold, apply a release agent such as alcohol to the surface of the mold as needed, and then stamp.

Meltability: 5 g of each solid detergent composition was cut into cubes, immersed in tap water for 1 hour, and the presence or absence of meltability was evaluated according to the following criteria. The evaluation was performed by 10 panelists according to the following criteria, and the average of the 10 panelists was 4.0 or less to 3.5 or more ◎; less than 3.5 to 2.5.
以上: less than 2.5 to 1.5 or more; Δ: less than 1.5. 4: Almost no disintegration 3: Slightly disintegration 2: A clear disintegration is seen 1: A considerable part is disintegrated

Solidity: In the preparation of the solid detergent composition, the condition of the solid detergent composition obtained by molding with a stamping machine was evaluated. The evaluation was performed by 10 panelists according to the following criteria, and the average of the 10 panelists was 4.0 or less.
3.5 or more ◎; less than 3.5 to 2.5 or more ○; 2.5
Less than 1.5 or more was evaluated as Δ; Less than 1.5 was evaluated as x. 4: very good 3: good 2: normal 1: bad

No cracking: Each solid detergent composition 20
g into a cube, at a constant temperature of 25 ° C and a relative humidity of 30% RH
After storing for 240 hours in the environment of the above, the state of the surface was observed and evaluated. The evaluation was conducted by 10 panelists according to the following criteria, and the average value of the 10 panelists was 3.5 or less.
以上 for 2.5 or more; Δ for less than 2.5 to 1.5 or more; 1.5
Less than was rated as ×. 3: Almost no cracks 2: Slight cracks 1: Clear cracks

Adhesion: 50 g of each solid detergent composition was placed on a glass plate to which 1 g of tap water was dropped, and after standing for 24 hours, the ease of peeling off each solid detergent composition from the glass plate was evaluated. . The evaluation was carried out by 10 panelists according to the following criteria.
以上 for 2.5 or more; Δ for less than 2.5 to 1.5 or more; 1.5
Less than was rated as ×. 3: Easy to peel 2: Slightly hard to peel 1: Very hard to peel

Hard water resistance: Each solid detergent composition was hand-washed using hard water and ion-exchanged water of 500 ppm of calcium chloride, and the foaming of both was compared and evaluated according to the following evaluation criteria. The evaluation was performed by 10 panelists according to the following criteria. Based on the average value of the 10 panelists, 3.0 or less to 2.5 or more was evaluated as ○; less than 2.5 to 1.5 or more as Δ;
Less than 5 was rated as x. 3: Hardly any difference is felt 2: Slightly less foam when washed with hard water 1: Slightly less foam when washed with hard water

Non-slimy feeling, foam feeling (stiffness / stickiness), foam amount: For each solid detergent composition, hand washing and face washing are performed with tap water at 40 ° C. to obtain a non-slimming feeling, foam feeling, foam The amount was evaluated according to the following criteria. The evaluation was performed by 10 panelists according to the following criteria. Based on the average value of 10 panelists, 3.0 or less to 2.5 or more were evaluated as O; less than 2.5 to 1.5 or more as Δ; did. 3: Slightly slimy and refreshing 2: Slightly slimy 1: Slightly slick 3: Foam stiff and sticky and good feel 2: Slightly stiff and lacking foam 1: Insufficient stiffness and stickiness of foam 3: Good foaming 2: Slightly insufficient foaming 1: Insufficient foaming

[0035]

[Table 1]

A solid detergent composition was produced with the following composition. The obtained solid detergent composition was excellent in none of disintegration, solidity, no crack, adhesion, and hard water resistance. In addition, there was no squeaky feeling and slimy feeling during use, and there was no feeling of bulkiness of the skin after use, and it was also excellent in lightness and foam stickiness and stiffness.

(Blending composition-1) (% by weight) Sodium N-coconut fatty acid acylglycine 30 N-sodium myristoylglycine 20 N-stearoylglutamate 20 Sodium coconut oil fatty acid 5 Citric acid 7 Cetanol 5 Glycerin 5 EDTA • 2Na0 .2 Titanium oxide 0.1 Hinokitiol 0.1 Methyl paraben 0.1 Colorant Appropriate amount Purified water residue

(Blending composition-2) (% by weight) N-lauroylglycine sodium 35 N-coconut oil fatty acid acylalanine potassium 15 N-hardened tallow fatty acid sodium acylglutamate 10 Citric acid 7 Cetanol 2 EDTA · 2Na 0.2 Titanium oxide 0.1 Dipotassium glycyrrhizinate 0.1 Triclosan 0.1 Colorant Appropriate amount Purified water residue

(Blending composition-3) (% by weight) N-lauroylalanine sodium 60 N-hardened sodium tallow fatty acid acylglutamate 20 Caramel 0.2 EDTA · 2Na 0.2 Titanium oxide 0.1 Dibutylhydroxytoluene 0.1 pH Adjusting agent Appropriate amount Colorant Appropriate amount Purified water Residue

[0040]

According to the present invention, a solid detergent composition having low irritation, excellent in solidity, hard to dissolve and disintegrate, excellent in use feeling, small in adhesion to a soap box and the like, and excellent in hard water resistance. Can be provided.

Claims (7)

[Claims] (A) an N-acyl neutral amino acid salt having an acyl group having 10 to 14 carbon atoms (however,
-Acyl neutral amino acids) and (B) 16 carbon atoms
It contains an N-acyl acidic amino acid salt having an acyl group of from 20 to 20 (including an unneutralized N-acyl acidic amino acid), and the weight ratio of component (A) to component (B) is (A)
/ (B) = 85/15 to 55/45. 2. In addition to the components (A) and (B), one or more of (C) a solid wax having a melting point of 40 ° C. to 120 ° C. and / or (D) an acidic amino acid and a salt thereof The solid detergent composition according to claim 1, comprising one or more of the following. 3. The method according to claim 1, wherein the N-acyl neutral amino acid salt is N-acylglycine salt, N-acylalanine salt, N-acyl-β-
The solid detergent composition according to claim 1 or 2, wherein the composition is selected from an alanine salt, an N-acyl-N-methyl-β-alanine salt, and an N-acylmethyltaurine salt. 4. The solid detergent composition according to claim 1, wherein the N-acyl acidic amino acid salt is selected from N-acyl glutamate and N-acyl aspartate. 5. The N-acyl neutral amino acid salt is selected from N-acyl glycine salt and N-acyl alanine salt, and the N-acyl acidic amino acid salt is N-acyl glutamate. 3. The solid detergent composition according to 2. 6. The N-acyl neutral amino acid salt and the N-acyl acidic amino acid salt are selected from sodium, potassium, magnesium, arginine, lysine and histidine salts. 6. The solid detergent composition according to 5. 7. The solid detergent composition according to claim 1, wherein the pH is 5.5 to 7.0.